KJo missed everything tried to bluff river.

[Zizz]

Some people are saying to fold KJo preflop which is the more standard play. It's not automatic though, if you want to raise it's fine. It's not a great play but it's not terrible.
But in regards to the postflop action: You have no information on the player you are making a play at and he has position on you. That is not good. I reserve plays like this when I've got a more solid feel for the player I'm against and think it will have a high success rate.